Are they allowed to show Hitlers face (picture) in Germany?
It depends on the purpose. This (from wikipedia) is a discussion of the law in question. Volksverhetzung (stirring up the populace by hatemongering, verhetzen means to warp the mind into hate by presenting extremely biased propaganda, possibly lies; official translation from German: “agitation of the people”) is a concept in German criminal law that bans the incitement of hatred against a minority of the population. It often applies in, though it is not limited to, trials relating to holocaust denial in Germany. Guilty of Volksverhetzung is who in a manner that is capable of disturbing the public peace: incites hatred against segments of the population or calls for violent or arbitrary measures against them; or assaults the human dignity of others by insulting, maliciously maligning, or defaming segments of the population[1] There are also special provisions for holocaust denial (added in the 1990s) and speech justifying or glorifying the Nazi government 1933-1945 (recently added). Alt
